my account in the server is saitobenkei@domain.tld and I want to be allow to send mails from my account only if in the "From: " field I put saitobenkei@domain.tld (my e-mail address) or some identities as pippo@domain.tld, saitobenkei@anotherdomain.tld, othermail@newdomain.tld (these are only identity that I allowed to use wit my account).